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Stability study and control methods for small-wattage high-intensity-discharge (HID) lamps

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3 Author(s)
Wei Yan ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Ho, Y.K.E. ; Hui, S.Y.R.

The increasing speed of modern power electronics opens a way to study the stability of high-intensity-discharge lamps at very-high-frequency operation. In this paper, a lamp stability study based on a simplified theory on acoustic resonance frequency distribution in a small-wattage metal-halide (MH) lamp is presented. The frequency characteristic of a low-wattage MH lamp has been analyzed. Up to 700 kHz, extensive experiments using resonant-type electronic ballast have been conducted on 35-W MH lamps to investigate different control methods for avoiding acoustic resonance. The results indicate that a randomized switching scheme cannot always eliminate are instabilities caused by acoustic resonances in small-wattage MH lamps. The stability frequency regions should be identified. A stable arc can be obtained when the lamp is operated above the highest acoustic resonance frequency

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Industry Applications, IEEE Transactions on  (Volume:37 ,  Issue: 5 )